Older versions like Plesk 11 are already prone to known vulnerabilities, such as SQL injection in API headers, which hackers can easily exploit.

Using pirated versions of hosting control panels is significantly more dangerous than using a nulled WordPress theme because the panel has to your entire server. 1. Severe Security Vulnerabilities

Attackers often use these "cracks" to inject crypto-miners, launch DDoS attacks from your server, or steal sensitive customer payment data. 2. Lack of Updates and Security Patches